Early fault section positioning method based on active injection

A technology of early fault and segment location, applied in fault location, fault detection according to conductor type, information technology support system, etc., can solve the problems of weak early fault characteristics, high reliability and difficult application, etc.

Pending Publication Date: 2021-10-01
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
View PDF4 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fault characteristics involved in the above method are related to the response of early faults under power frequency voltage or current excitation, so it is difficult to apply in DC scenarios, and the early fault characteristics are weak, making it difficult to determine the threshold of fault identification criteria
The research on i

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Early fault section positioning method based on active injection
  • Early fault section positioning method based on active injection
  • Early fault section positioning method based on active injection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0018] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings, as figure 1 Shown is a schematic flowchart of an early fault section location method based on active injection provided by an embodiment of the present invention, and the method includes:

[0019] Step 1. Based on the early fault characteristics of the DC cable, construct the early fault model expression of the flexib...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses an early fault section positioning method based on active injection. The method comprises the steps: firstly constructing an early fault model expression of a flexible DC system based on the early fault features of a DC cable; based on the constructed early fault model expression, utilizing active control on a DC/AC converter to actively inject disturbance current into the flexible direct current system; and according to the early fault characteristics after the disturbance current is injected, obtaining an early fault identification criterion, and making an early fault processing scheme of the flexible DC system based on the early fault identification criterion. The method can be used to accurately identify and position an early fault section, timely isolates a fault branch, has certain anti-noise capability, and provides guarantee for continuous and reliable operation of the flexible DC power distribution system.

Description

technical field [0001] The invention relates to the technical field of grid-connected new energy power generation, in particular to an early fault section location method based on active injection. Background technique [0002] In the flexible DC distribution network, due to the limited overcurrent resistance of fully-controlled power electronic devices, once a short-circuit fault occurs between poles, the converters of the whole network will be quickly blocked in a very short time, resulting in a long-term power failure of the system, which will cause great damage. Reduced system reliability. For this reason, how to solve the problem of system outage caused by DC short-circuit faults has become an urgent problem to be overcome in the protection of flexible DC distribution networks. The high-frequency protection scheme is designed to prevent the converter from being blocked due to overcurrent by protecting the high-speed outlet and the selective tripping of the DC circuit b...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01R31/08
CPCG01R31/086Y04S10/52
Inventor 贾科施志明毕天姝李俊涛陈聪陈淼刘鑫钮厚敏
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap